Vonage is set to release a WiFi telephone soon. I’ve heard about these, and perhaps they’re already for sale, however it’s an insanely cool idea! For example, you could take this phone anywhere you want and as long as they have a WiFi connection you’re set to go! This would be perfect for people who have multiple offices and want to take their “landline” phone with them. Pretty cool idea.
It fails in a few areas though: With Vonage you can forward calls to your cell phone if you don’t answer. Still, the idea is really nice and I’d think perfect for people who have a home phone number and want to take it with them (to work for example) but don’t need a cell phone. Phone specs are here.